The calculated distance (air line) between Néa Smýrni and Maroúsi is approximately 9 miles respectively 14 kilometers.
By car or train, the actual journey to Maroúsi is certainly longer, as only the direct route (as the crow flies) between Néa Smýrni and Maroúsi has been calculated here.
Air line (approximately)
14 kilometers
7 nautical miles